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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income	$ 28,009	$ 36,595	$ 32,347	$ 45,482
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	203,574,282	200,810,323	202,366,359	200,732,639
Effect of dilutive securities:
Weighted-average number of common shares outstanding—diluted (in shares)	204,516,142	201,741,394	203,366,890	201,729,516
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.14	$ 0.18	$ 0.16	$ 0.23
Diluted earnings per share (in dollars per share)	$ 0.14	$ 0.18	$ 0.16	$ 0.23
Unvested restricted common stock
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	148,608	99,677	207,279	165,483
Shares related to unvested PSUs
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	793,252	831,394	793,252	831,394

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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